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Method and apparatus for encoding/decoding audio signal using adaptive lpc coefficient interpolation

Inactive Publication Date: 2009-08-06
SAMSUNG ELECTRONICS CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Benefits of technology

[0009]The present invention provides a method and apparatus for encoding and decoding an audio signal by selectively interpolating an LPC coefficient within a frame containing a transient signal, thereby improving the efficiency of the LPC.

Problems solved by technology

In case of processing the audio signal in units of frames, a discontinuous point is generated between adjacent frames due to a quantization error and so on, thus deteriorating audio quality.
Accordingly, a related art method of interpolating an LPC coefficient is disadvantageous in that a change in an LPC coefficient in a transient section increases an error, thus causing noise.

Method used

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  • Method and apparatus for encoding/decoding audio signal using adaptive lpc coefficient interpolation

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Embodiment Construction

[0025]Hereinafter, exemplary embodiments of the present invention will be described in greater detail with reference to the attached drawings. Like reference numerals denote like elements throughout the drawings.

[0026]FIG. 2 is a block diagram of an audio signal encoding apparatus 200 (“the encoding apparatus”) according to an exemplary embodiment of the present invention. Referring to FIG. 2, the encoding apparatus 200 includes a division unit 210, a window determination unit 220, a window application unit 230, an LPC analysis unit 240, an LPC synthesis unit 250, a subtraction unit 260, and a multiplexing unit 270.

[0027]The division unit 210 divides an input audio signal into units of frames of a predetermined length. The window determination unit 220 determines a window that is to be applied to a current frame according to the audio signal characteristics of the current frame. For continuous processing of the audio signal, the division unit 210 divides the audio signal into units ...

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Abstract

Provided are a method and apparatus for encoding or decoding an audio signal by adaptively interpolating a linear predictive coding (LPC) coefficient. In the method and apparatus of encoding or decoding an audio signal, LPC coefficient interpolation is selectively performed depending on whether a transient section is present in a current frame, thereby preventing noise from occurring when interpolating LPC coefficients in the transient section.

Description

CROSS-REFERENCE TO RELATED PATENT APPLICATIONS[0001]This application claims the priority from Korean Patent Application No. 10-2008-0009009, filed on Jan. 29, 2008 in the Korean Intellectual Property Office, the disclosure of which is incorporated herein in its entirety by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]Methods and apparatuses consistent with the present invention relate to encoding and decoding an audio signal, and more particularly, to encoding or decoding an audio signal by adaptively interpolating a linear predictive coding (LPC) coefficient depending on whether a transient signal is present in an audio signal in a current frame.[0004]2. Description of the Related Art[0005]In general, an audio signal is processed in units of predetermined time units which are referred to as frames. In case of processing the audio signal in units of frames, a discontinuous point is generated between adjacent frames due to a quantization error and so on, ...

Claims

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Application Information

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IPC IPC(8): G10L21/00G10L19/02G10L19/025G10L19/04
CPCG10L19/04G10L19/025G10L19/00G10L19/06
Inventor JEONG, JONG-HOONLEE, GEON-HYOUNGLEE, CHUL-WOOLEE, NAM-SUKMOON, HAN-GIL
Owner SAMSUNG ELECTRONICS CO LTD
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